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{ &#34;Hostname&#34;: &#34;docs&#34;, &#34;Packages&#34;: [ &#34;github.com/gokrazy/fbstatus&#34;, &#34;github.com/gokrazy/hello&#34;, &#34;github.com/gokrazy/serial-busybox&#34;, &#34;github.com/gokrazy/breakglass&#34; ] } …gokrazy will start the fbstatus, hello, serial-busybox and breakglass programs.
Package config This article shows how you can configure different aspects of individual packages.">
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    <meta name="twitter:description" content="gokrazy will arrange for each included package to be started at boot. For example, given the following instance config.json (open in your editor using gok edit):
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Package config This article shows how you can configure different aspects of individual packages.">
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    <meta property="og:description" content="gokrazy will arrange for each included package to be started at boot. For example, given the following instance config.json (open in your editor using gok edit):
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Package config This article shows how you can configure different aspects of individual packages.">
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    <meta itemprop="description" content="gokrazy will arrange for each included package to be started at boot. For example, given the following instance config.json (open in your editor using gok edit):
{ &#34;Hostname&#34;: &#34;docs&#34;, &#34;Packages&#34;: [ &#34;github.com/gokrazy/fbstatus&#34;, &#34;github.com/gokrazy/hello&#34;, &#34;github.com/gokrazy/serial-busybox&#34;, &#34;github.com/gokrazy/breakglass&#34; ] } …gokrazy will start the fbstatus, hello, serial-busybox and breakglass programs.
Package config This article shows how you can configure different aspects of individual packages.">
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<h1 id="package-config-flags-environment-variables-extra-files">Package config: flags, environment variables, extra files</h1>

<p>gokrazy will arrange for each included package to be started at boot. For
example, given the following instance <code>config.json</code> (open in your editor using
<code>gok edit</code>):</p>
<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-json" data-lang="json"><span style="display:flex;"><span>{
</span></span><span style="display:flex;"><span>    <span style="color:#f92672">&#34;Hostname&#34;</span>: <span style="color:#e6db74">&#34;docs&#34;</span>,
</span></span><span style="display:flex;"><span>    <span style="color:#f92672">&#34;Packages&#34;</span>: [
</span></span><span style="display:flex;"><span>        <span style="color:#e6db74">&#34;github.com/gokrazy/fbstatus&#34;</span>,
</span></span><span style="display:flex;"><span>        <span style="color:#e6db74">&#34;github.com/gokrazy/hello&#34;</span>,
</span></span><span style="display:flex;"><span>        <span style="color:#e6db74">&#34;github.com/gokrazy/serial-busybox&#34;</span>,
</span></span><span style="display:flex;"><span>        <span style="color:#e6db74">&#34;github.com/gokrazy/breakglass&#34;</span>
</span></span><span style="display:flex;"><span>    ]
</span></span><span style="display:flex;"><span>}</span></span></code></pre></div>
<p>…gokrazy will start the <code>fbstatus</code>, <code>hello</code>, <code>serial-busybox</code> and <code>breakglass</code>
programs.</p>
<h2 id="package-config">Package config<span class="btn cstyle anchor copyanchor scrollanchor link noborder notitle interactive"><button type="button" title="Copy link to clipboard"><i class="fa-fw fas fa-link fa-lg"></i></button></span></h2>
<p>This article shows how you can configure different aspects of individual
packages.</p>
<p>Each bit of configuration is nested under the <code>PackageConfig</code> map field in your
instance’s <code>config.json</code>, see <a href="/userguide/instance-config/index.html#packageconfig">Instance Config Reference →
<code>PackageConfig</code></a>. The map is keyed by
package name (from the <code>Packages</code> field), and each map entry can have the
following fields:</p>
<ul>
<li><code>CommandLineFlags</code> for <a href="/userguide/package-config/index.html#flags">Command-line flags</a></li>
<li><code>Environment</code> for <a href="/userguide/package-config/index.html#env">Environment variables</a></li>
<li><code>GoBuildFlags</code> for <a href="/userguide/package-config/index.html#buildflags">Go build flags</a></li>
<li><code>ExtraFilePaths</code> or <code>ExtraFileContents</code> for <a href="/userguide/package-config/index.html#extrafiles">Extra files</a></li>
</ul>
<h2 id="flags">Command-line flags<span class="btn cstyle anchor copyanchor scrollanchor link noborder notitle interactive"><button type="button" title="Copy link to clipboard"><i class="fa-fw fas fa-link fa-lg"></i></button></span></h2>
<p>The <a href="https://github.com/gokrazy/breakglass" rel="external">breakglass</a> package provides
emergency/debugging access to a gokrazy installation.</p>
<p>To enable SSH port forwardings to localhost, set the <code>-forward</code> flag to <code>loopback</code>:</p>
<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-json" data-lang="json"><span style="display:flex;"><span>{
</span></span><span style="display:flex;"><span>    <span style="color:#f92672">&#34;PackageConfig&#34;</span>: {
</span></span><span style="display:flex;"><span>        <span style="color:#f92672">&#34;github.com/gokrazy/breakglass&#34;</span>: {
</span></span><span style="display:flex;"><span>            <span style="color:#f92672">&#34;CommandLineFlags&#34;</span>: [
</span></span><span style="display:flex;"><span>                <span style="color:#e6db74">&#34;-forward=loopback&#34;</span>
</span></span><span style="display:flex;"><span>            ]
</span></span><span style="display:flex;"><span>        }
</span></span><span style="display:flex;"><span>    },
</span></span><span style="display:flex;"><span>    <span style="color:#960050;background-color:#1e0010">…</span>
</span></span><span style="display:flex;"><span>}</span></span></code></pre></div>
<h2 id="env">Environment variables<span class="btn cstyle anchor copyanchor scrollanchor link noborder notitle interactive"><button type="button" title="Copy link to clipboard"><i class="fa-fw fas fa-link fa-lg"></i></button></span></h2>
<p><a href="https://en.wikipedia.org/wiki/Environment_variable" rel="external">Environment variables</a> such
as the <a href="https://golang.org/pkg/runtime/" rel="external">Go runtime’s <code>GODEBUG</code></a> variable can be
set as follows:</p>
<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-json" data-lang="json"><span style="display:flex;"><span>{
</span></span><span style="display:flex;"><span>    <span style="color:#f92672">&#34;PackageConfig&#34;</span>: {
</span></span><span style="display:flex;"><span>        <span style="color:#f92672">&#34;github.com/gokrazy/breakglass&#34;</span>: {
</span></span><span style="display:flex;"><span>            <span style="color:#f92672">&#34;Environment&#34;</span>: [
</span></span><span style="display:flex;"><span>                <span style="color:#e6db74">&#34;GODEBUG=gctrace=1&#34;</span>
</span></span><span style="display:flex;"><span>            ]
</span></span><span style="display:flex;"><span>        }
</span></span><span style="display:flex;"><span>    },
</span></span><span style="display:flex;"><span>    <span style="color:#960050;background-color:#1e0010">…</span>
</span></span><span style="display:flex;"><span>}</span></span></code></pre></div>
<h2 id="buildflags">Go build flags<span class="btn cstyle anchor copyanchor scrollanchor link noborder notitle interactive"><button type="button" title="Copy link to clipboard"><i class="fa-fw fas fa-link fa-lg"></i></button></span></h2>
<p>If you want to influence the build of the package at image-creation time (as
opposed to runtime), you can specify flags to be passed to the Go build
invocation.</p>
<p>This example overwrites the value of the <a href="https://github.com/gokrazy/hello/blob/e33b5caa1a73b5e58e4d4f4b165d07e6ddf173a9/hello.go#L6" rel="external"><code>world</code>
variable</a>
using the <a href="https://golang.org/cmd/link/" rel="external"><code>-X</code> linker flag</a>, which is a common
technique to embed version information:</p>
<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-json" data-lang="json"><span style="display:flex;"><span>{
</span></span><span style="display:flex;"><span>    <span style="color:#f92672">&#34;PackageConfig&#34;</span>: {
</span></span><span style="display:flex;"><span>        <span style="color:#f92672">&#34;github.com/gokrazy/hello&#34;</span>: {
</span></span><span style="display:flex;"><span>            <span style="color:#f92672">&#34;GoBuildFlags&#34;</span>: [
</span></span><span style="display:flex;"><span>                <span style="color:#e6db74">&#34;-ldflags=-X main.world=Welt&#34;</span>
</span></span><span style="display:flex;"><span>            ]
</span></span><span style="display:flex;"><span>        }
</span></span><span style="display:flex;"><span>    },
</span></span><span style="display:flex;"><span>    <span style="color:#960050;background-color:#1e0010">…</span>
</span></span><span style="display:flex;"><span>}</span></span></code></pre></div>
<h2 id="extrafiles">Extra files<span class="btn cstyle anchor copyanchor scrollanchor link noborder notitle interactive"><button type="button" title="Copy link to clipboard"><i class="fa-fw fas fa-link fa-lg"></i></button></span></h2>
<p>If your program needs extra files to be present in gokrazy’s root file system
image at a specific location, you can add them with the <code>extrafiles</code> mechanism:</p>
<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-json" data-lang="json"><span style="display:flex;"><span>{
</span></span><span style="display:flex;"><span>    <span style="color:#f92672">&#34;PackageConfig&#34;</span>: {
</span></span><span style="display:flex;"><span>        <span style="color:#f92672">&#34;github.com/caddyserver/caddy/v2/cmd/caddy&#34;</span>: {
</span></span><span style="display:flex;"><span>            <span style="color:#f92672">&#34;ExtraFileContents&#34;</span>: {
</span></span><span style="display:flex;"><span>                <span style="color:#f92672">&#34;/etc/caddy/Caddyfile&#34;</span>: <span style="color:#e6db74">&#34;http://:80 {
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">	root * /tmp
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">	file_server browse
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">}
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">&#34;</span>
</span></span><span style="display:flex;"><span>            }
</span></span><span style="display:flex;"><span>        }
</span></span><span style="display:flex;"><span>    },
</span></span><span style="display:flex;"><span>    <span style="color:#960050;background-color:#1e0010">…</span>
</span></span><span style="display:flex;"><span>}</span></span></code></pre></div>
<p>Or, if managing the file contents within the <code>config.json</code> becomes unwieldy, you
can manage it in a separate file:</p>
<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>cat &gt; ~/gokrazy/hello/Caddyfile <span style="color:#e6db74">&lt;&lt;&#39;EOT&#39;
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">http://:80 {
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">	root * /tmp
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">	file_server browse
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">}
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">EOT</span></span></span></code></pre></div>
<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-json" data-lang="json"><span style="display:flex;"><span>{
</span></span><span style="display:flex;"><span>    <span style="color:#f92672">&#34;PackageConfig&#34;</span>: {
</span></span><span style="display:flex;"><span>        <span style="color:#f92672">&#34;github.com/caddyserver/caddy/v2/cmd/caddy&#34;</span>: {
</span></span><span style="display:flex;"><span>            <span style="color:#f92672">&#34;ExtraFilePaths&#34;</span>: {
</span></span><span style="display:flex;"><span>                <span style="color:#f92672">&#34;/etc/caddy/Caddyfile&#34;</span>: <span style="color:#e6db74">&#34;Caddyfile&#34;</span>
</span></span><span style="display:flex;"><span>            }
</span></span><span style="display:flex;"><span>        }
</span></span><span style="display:flex;"><span>    },
</span></span><span style="display:flex;"><span>    <span style="color:#960050;background-color:#1e0010">…</span>
</span></span><span style="display:flex;"><span>}</span></span></code></pre></div>

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